$-21m^3n+-12m^3n+15m^3n$
$\frac{14}{6}-\frac{1}{3}$
$4y^2-7y^2-6y^2$
$\frac{1}{4}ka-\frac{1}{8}ka$
$-3-9\left|1-3+\left(8+2-1\right)-\left(2-5\right)-13\right|+4-3$
$\:-5\:-\:2\left(9f\:+\:4\right)$
$6\sin\left(x\right)\cos\left(x\right)=2\sin\left(x\right)$
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